全文获取类型
收费全文 | 10139篇 |
免费 | 265篇 |
专业分类
各国政治 | 328篇 |
工人农民 | 326篇 |
世界政治 | 620篇 |
外交国际关系 | 304篇 |
法律 | 7139篇 |
中国政治 | 63篇 |
政治理论 | 1551篇 |
综合类 | 73篇 |
出版年
2020年 | 122篇 |
2019年 | 145篇 |
2018年 | 183篇 |
2017年 | 196篇 |
2016年 | 218篇 |
2015年 | 136篇 |
2014年 | 202篇 |
2013年 | 877篇 |
2012年 | 246篇 |
2011年 | 303篇 |
2010年 | 224篇 |
2009年 | 212篇 |
2008年 | 277篇 |
2007年 | 321篇 |
2006年 | 307篇 |
2005年 | 248篇 |
2004年 | 288篇 |
2003年 | 296篇 |
2002年 | 253篇 |
2001年 | 439篇 |
2000年 | 396篇 |
1999年 | 305篇 |
1998年 | 104篇 |
1997年 | 84篇 |
1996年 | 89篇 |
1995年 | 84篇 |
1994年 | 90篇 |
1993年 | 88篇 |
1992年 | 194篇 |
1991年 | 228篇 |
1990年 | 210篇 |
1989年 | 232篇 |
1988年 | 221篇 |
1987年 | 221篇 |
1986年 | 198篇 |
1985年 | 218篇 |
1984年 | 180篇 |
1983年 | 191篇 |
1982年 | 114篇 |
1981年 | 112篇 |
1980年 | 82篇 |
1979年 | 127篇 |
1978年 | 101篇 |
1977年 | 85篇 |
1976年 | 82篇 |
1974年 | 89篇 |
1973年 | 91篇 |
1972年 | 72篇 |
1971年 | 80篇 |
1970年 | 78篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
891.
892.
Assessing hypostasis by colorimetry. 总被引:2,自引:0,他引:2
P Vanezis 《Forensic science international》1991,52(1):1-3
893.
Preservation of human tissue immersed for five years in fresh water of known temperature 总被引:2,自引:0,他引:2
Two human bodies were recovered from the waters of the Duluth, Minnesota harbor. Extensive adipocere formation resulted in remarkable preservation of gross anatomic features of internal organs. Total time of immersion could be precisely estimated at five years. Water temperature during those five years could also be accurately estimated by direct measurements taken during the year following recovery of the bodies and from information supplied by a local electric power generating company. Immersion occurred at the time of the year when water temperature was highest (70 degrees F [21 degrees C]) facilitating the rapid formation of adipocere. A proposed mechanism for formation of adipocere is described. 相似文献
894.
895.
896.
897.
898.
899.
Death associated with inadvertent hydrocodone overdose in a child with a respiratory tract infection
A 3-year-old child died of the combined effects of a bacterial superinfection and a relative overdose of hydrocodone prescribed for a cough due to a presumed viral respiratory tract infection. This case illustrates the importance of evaluating the effects of prescribed medication in assessing the cause and mechanism of death in children dying suddenly of presumed natural disease. 相似文献
900.
Shane Darke Ph.D. Johan Duflou M.Med.Path. F.R.C.P.A. Michelle Torok B.Soc.Sc. 《Journal of forensic sciences》2009,54(2):490-494
Abstract: To determine the prevalence and circumstances of psychoactive substances amongst nonoverdose completed suicide, 1436 consecutive cases autopsied at the NSW Department of Forensic Medicine over the period 1/1/1997–12/31/2006 were analyzed. Substances were detected in 67.2% of cases, and illicit drugs in 20.1%. Alcohol was present in 40.6% of cases. Males were more likely to be positive for alcohol, cannabis, and psychostimulants, and females for pharmaceuticals. Illicits were associated with younger age. Alcohol was most prominent amongst toxicity cases, as were opioids, psychostimulants amongst gunshot cases, and pharmaceuticals amongst drownings. Cases in which drug and alcohol histories were noted were more likely to have a substance detected. Alcohol was more common where a suicide note was left and where relationship problems were involved. Pharmaceuticals were more common where a previous attempt was noted. Licit and illicit substances are strongly associated with suicide, even when the method does not involve drug overdose. 相似文献